/* Copyright  (c) 2002 Graz University of Technology. All rights reserved.
 *
 * Redistribution and use in  source and binary forms, with or without 
 * modification, are permitted  provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in  binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment:
 * 
 *    "This product includes software developed by IAIK of Graz University of
 *     Technology."
 * 
 *    Alternately, this acknowledgment may appear in the software itself, if 
 *    and wherever such third-party acknowledgments normally appear.
 *  
 * 4. The names "Graz University of Technology" and "IAIK of Graz University of
 *    Technology" must not be used to endorse or promote products derived from 
 *    this software without prior written permission.
 *  
 * 5. Products derived from this software may not be called 
 *    "IAIK PKCS Wrapper", nor may "IAIK" appear in their name, without prior 
 *    written permission of Graz University of Technology.
 *  
 *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
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 *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
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 */

package demo.pkcs.pkcs11;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

import iaik.pkcs.pkcs11.Mechanism;
import iaik.pkcs.pkcs11.Module;
import iaik.pkcs.pkcs11.Session;
import iaik.pkcs.pkcs11.Token;
import iaik.pkcs.pkcs11.TokenInfo;
import iaik.pkcs.pkcs11.objects.DES3SecretKey;
import iaik.pkcs.pkcs11.objects.Key;
import iaik.pkcs.pkcs11.objects.SecretKey;
import iaik.pkcs.pkcs11.parameters.DesCbcEncryptDataParameters;

/**
 * This demo program shows how to derive a DES3 key.
 *
 * @invariants
 */
public class DeriveKeyDemo {
  
  static BufferedReader input_;
  static PrintWriter output_;

  static {
    try {
      //output_ = new PrintWriter(new FileWriter("SignAndVerify_output.txt"), true);
      output_ = new PrintWriter(System.out, true);
      input_ = new BufferedReader(new InputStreamReader(System.in));
    } catch (Throwable thr) {
      thr.printStackTrace();
      output_ = new PrintWriter(System.out, true);
      input_ = new BufferedReader(new InputStreamReader(System.in));
   }
  }

  public static void main(String[] args) {
    if (args.length != 1) {
      printUsage();
      System.exit(1);
    }
    try {
      Module pkcs11Module = Module.getInstance(args[0]);
      pkcs11Module.initialize(null);
  
      Token token = Util.selectToken(pkcs11Module, output_, input_);
      TokenInfo tokenInfo = token.getTokenInfo();
  
      output_.println("################################################################################");
      output_.println("Using token:");
      output_.println(tokenInfo);
      output_.println("################################################################################");
  
      Session session = Util.openAuthorizedSession(token, Token.SessionReadWriteBehavior.RO_SESSION, output_, input_);
      
      Mechanism keyGenerationMechanism = (Mechanism) Mechanism.DES3_KEY_GEN.clone();
      DES3SecretKey baseKeyTemplate = new DES3SecretKey();
      
      baseKeyTemplate.getDerive().setBooleanValue(Boolean.TRUE);
      // we only have a read-only session, thus we only create a session object
      baseKeyTemplate.getToken().setBooleanValue(Boolean.FALSE);
      baseKeyTemplate.getSensitive().setBooleanValue(Boolean.FALSE);
      baseKeyTemplate.getExtractable().setBooleanValue(Boolean.TRUE);
      SecretKey baseKey = (SecretKey) session.generateKey(keyGenerationMechanism, baseKeyTemplate);

      System.out.println("Base key: ");
      System.out.println(baseKey.toString());

      output_.println("################################################################################");
      output_.println("derive key");

      //DES3 Key Template
      DES3SecretKey derived3DESKeyTemplate = new DES3SecretKey();
      SecretKey derivedKeyTemplate = derived3DESKeyTemplate;
    
      derivedKeyTemplate.getSensitive().setBooleanValue(Boolean.FALSE);
      derivedKeyTemplate.getExtractable().setBooleanValue(Boolean.TRUE);
    
      byte[] iv = new byte[8];
      byte[] data = new byte[24];
      
      DesCbcEncryptDataParameters param = new DesCbcEncryptDataParameters(iv, data);
      Mechanism mechanism = (Mechanism) Mechanism.DES3_CBC_ENCRYPT_DATA;
      mechanism.setParameters(param);
      
      System.out.println("Derivation Mechanism: ");
      output_.println(mechanism.toString());
      output_.println("--------------------------------------------------------------------------------");


      Key derivedKey = session.deriveKey(mechanism, baseKey, derivedKeyTemplate);

      if (derivedKey == null){
        output_.println("Found NO key that can be used for encryption.");
        output_.flush();
        System.exit(0);
      }
      System.out.println("Derived key: ");
      output_.println(derivedKey.toString());

      output_.println("################################################################################");
      output_.println("finished");

      session.closeSession();
      pkcs11Module.finalize(null);

    } catch (Throwable thr) {
      thr.printStackTrace();
    }
  }
  
  public static void printUsage() {
    output_.println("Usage: TestDeriveParams <PKCS#11 module>");
    output_.println(" e.g.: TestDeriveParams cryptoki.dll");
    output_.println("The given DLL must be in the search path of the system.");
  }

}